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JPS555548A - Signal control circuit - Google Patents

Signal control circuit

Info

Publication number
JPS555548A
JPS555548A JP7883678A JP7883678A JPS555548A JP S555548 A JPS555548 A JP S555548A JP 7883678 A JP7883678 A JP 7883678A JP 7883678 A JP7883678 A JP 7883678A JP S555548 A JPS555548 A JP S555548A
Authority
JP
Japan
Prior art keywords
signal
circuit
output
side tone
inputted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7883678A
Other languages
Japanese (ja)
Other versions
JPS6126740B2 (en
Inventor
Kazuyoshi Fujiyoshi
Takaharu Murakami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7883678A priority Critical patent/JPS555548A/en
Publication of JPS555548A publication Critical patent/JPS555548A/en
Publication of JPS6126740B2 publication Critical patent/JPS6126740B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To establish the characteristics of side tone prevention stably, even if the signal source impedance is changed, in the signal control circuit performing the side tone preventing operation. CONSTITUTION:The output of the signal source 21 is branched with the connection point 23. One is inputted to the switching circuit 26 and another is inputted to the switching circuit 28 after being inverted at the phase inversion circuit 27, and it is outputted as the modulation wave modulating the outputs 34, 35 in opposite phase each other of the oscillator 29. At the connection point 24, the both outputs are synthesized and also the signal positive-feeding back the output of the LPF 30 via the output 31, is synthesized. Although the signal at the connection point 24 is inputted to the switching circuit 32, since the circuit 32 and the circuit 28 are in synchronizing with each other, the output signal to the terminal 33 is zeroed to cancel the side tone. Further, even if the impedance of the signal source 22 is changed, since the signal canceling is increased or decreased toward the same direction, the side tone is always closed to zero.
JP7883678A 1978-06-28 1978-06-28 Signal control circuit Granted JPS555548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7883678A JPS555548A (en) 1978-06-28 1978-06-28 Signal control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7883678A JPS555548A (en) 1978-06-28 1978-06-28 Signal control circuit

Publications (2)

Publication Number Publication Date
JPS555548A true JPS555548A (en) 1980-01-16
JPS6126740B2 JPS6126740B2 (en) 1986-06-21

Family

ID=13672904

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7883678A Granted JPS555548A (en) 1978-06-28 1978-06-28 Signal control circuit

Country Status (1)

Country Link
JP (1) JPS555548A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122553A (en) * 1982-12-28 1984-07-16 Onahama Sakai Kagaku Kk Preparation of surface-treated plate barium sulfate
JPS59122554A (en) * 1982-12-28 1984-07-16 Onahama Sakai Kagaku Kk Preparation of surface-treating barium sulfate
JPS6071996A (en) * 1983-09-29 1985-04-23 チッソ株式会社 Heavy metal group composition for radiation defensive material
JPH0269317A (en) * 1988-07-22 1990-03-08 Eka Nobel Ab Production of acid-resistant coating on filler particles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0431346Y2 (en) * 1987-10-12 1992-07-28

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122553A (en) * 1982-12-28 1984-07-16 Onahama Sakai Kagaku Kk Preparation of surface-treated plate barium sulfate
JPS59122554A (en) * 1982-12-28 1984-07-16 Onahama Sakai Kagaku Kk Preparation of surface-treating barium sulfate
JPS6225708B2 (en) * 1982-12-28 1987-06-04 Onahama Sakai Kagaku Kk
JPS6225707B2 (en) * 1982-12-28 1987-06-04 Onahama Sakai Kagaku Kk
JPS6071996A (en) * 1983-09-29 1985-04-23 チッソ株式会社 Heavy metal group composition for radiation defensive material
JPH0359400B2 (en) * 1983-09-29 1991-09-10 Chisso Corp
JPH0269317A (en) * 1988-07-22 1990-03-08 Eka Nobel Ab Production of acid-resistant coating on filler particles

Also Published As

Publication number Publication date
JPS6126740B2 (en) 1986-06-21

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